Sulfamic Acid

Continuing my post on crystal growing.
This time it is sulfamic acid: a chemical compound with formula H3NSO3.
It is colorless solid, well soluble in water. Its primary use is descaling agent (I obtained it from dishwasher descaler).
Sulfamic acid crystallizes very well, crystals are growing transparent and shiny. Crystal system is orthorombic. My specimens have opaque defects inside, but with some patience it is possible to grow them completely clear.

Showing the size of my specimens. Growth time is around 3 weeks, using slow evaporation method.